target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_mdio.c

   1 /*
   2  *  Atheros AR71xx built-in ethernet mac driver
   3  *
   4  *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
   5  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   6  *
   7  *  Based on Atheros' AG7100 driver
   8  *
   9  *  This program is free software; you can redistribute it and/or modify it
  10  *  under the terms of the GNU General Public License version 2 as published
  11  *  by the Free Software Foundation.
  12  */
  13
  14 #include "ag71xx.h"
  15
  16 #define AG71XX_MDIO_RETRY       1000
  17 #define AG71XX_MDIO_DELAY       5
  18
  19 static inline void ag71xx_mdio_wr(struct ag71xx_mdio *am, unsigned reg,
  20                                   u32 value)
  21 {
  22         void __iomem *r;
  23
  24         r = am->mdio_base + reg;
  25         __raw_writel(value, r);
  26
  27         /* flush write */
  28         (void) __raw_readl(r);
  29 }
  30
  31 static inline u32 ag71xx_mdio_rr(struct ag71xx_mdio *am, unsigned reg)
  32 {
  33         return __raw_readl(am->mdio_base + reg);
  34 }
  35
  36 static void ag71xx_mdio_dump_regs(struct ag71xx_mdio *am)
  37 {
  38         DBG("%s: mii_cfg=%08x, mii_cmd=%08x, mii_addr=%08x\n",
  39                 am->mii_bus->name,
  40                 ag71xx_mdio_rr(am, AG71XX_REG_MII_CFG),
  41                 ag71xx_mdio_rr(am, AG71XX_REG_MII_CMD),
  42                 ag71xx_mdio_rr(am, AG71XX_REG_MII_ADDR));
  43         DBG("%s: mii_ctrl=%08x, mii_status=%08x, mii_ind=%08x\n",
  44                 am->mii_bus->name,
  45                 ag71xx_mdio_rr(am, AG71XX_REG_MII_CTRL),
  46                 ag71xx_mdio_rr(am, AG71XX_REG_MII_STATUS),
  47                 ag71xx_mdio_rr(am, AG71XX_REG_MII_IND));
  48 }
  49
  50 int ag71xx_mdio_mii_read(struct ag71xx_mdio *am, int addr, int reg)
  51 {
  52         int ret;
  53         int i;
  54
  55         ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_WRITE);
  56         ag71xx_mdio_wr(am, AG71XX_REG_MII_ADDR,
  57                         ((addr & 0xff) << MII_ADDR_SHIFT) | (reg & 0xff));
  58         ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_READ);
  59
  60         i = AG71XX_MDIO_RETRY;
  61         while (ag71xx_mdio_rr(am, AG71XX_REG_MII_IND) & MII_IND_BUSY) {
  62                 if (i-- == 0) {
  63                         printk(KERN_ERR "%s: mii_read timed out\n",
  64                                 am->mii_bus->name);
  65                         ret = 0xffff;
  66                         goto out;
  67                 }
  68                 udelay(AG71XX_MDIO_DELAY);
  69         }
  70
  71         ret = ag71xx_mdio_rr(am, AG71XX_REG_MII_STATUS) & 0xffff;
  72         ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_WRITE);
  73
  74         DBG("mii_read: addr=%04x, reg=%04x, value=%04x\n", addr, reg, ret);
  75
  76 out:
  77         return ret;
  78 }
  79
  80 void ag71xx_mdio_mii_write(struct ag71xx_mdio *am, int addr, int reg, u16 val)
  81 {
  82         int i;
  83
  84         DBG("mii_write: addr=%04x, reg=%04x, value=%04x\n", addr, reg, val);
  85
  86         ag71xx_mdio_wr(am, AG71XX_REG_MII_ADDR,
  87                         ((addr & 0xff) << MII_ADDR_SHIFT) | (reg & 0xff));
  88         ag71xx_mdio_wr(am, AG71XX_REG_MII_CTRL, val);
  89
  90         i = AG71XX_MDIO_RETRY;
  91         while (ag71xx_mdio_rr(am, AG71XX_REG_MII_IND) & MII_IND_BUSY) {
  92                 if (i-- == 0) {
  93                         printk(KERN_ERR "%s: mii_write timed out\n",
  94                                 am->mii_bus->name);
  95                         break;
  96                 }
  97                 udelay(AG71XX_MDIO_DELAY);
  98         }
  99 }
 100
 101 static int ag71xx_mdio_reset(struct mii_bus *bus)
 102 {
 103         struct ag71xx_mdio *am = bus->priv;
 104         u32 t;
 105
 106         if (am->pdata->is_ar7240)
 107                 t = MII_CFG_CLK_DIV_6;
 108         else
 109                 t = MII_CFG_CLK_DIV_28;
 110
 111         ag71xx_mdio_wr(am, AG71XX_REG_MII_CFG, t | MII_CFG_RESET);
 112         udelay(100);
 113
 114         ag71xx_mdio_wr(am, AG71XX_REG_MII_CFG, t);
 115         udelay(100);
 116
 117         return 0;
 118 }
 119
 120 static int ag71xx_mdio_read(struct mii_bus *bus, int addr, int reg)
 121 {
 122         struct ag71xx_mdio *am = bus->priv;
 123
 124         if (am->pdata->is_ar7240)
 125                 return ar7240sw_phy_read(bus, addr, reg);
 126         else
 127                 return ag71xx_mdio_mii_read(am, addr, reg);
 128 }
 129
 130 static int ag71xx_mdio_write(struct mii_bus *bus, int addr, int reg, u16 val)
 131 {
 132         struct ag71xx_mdio *am = bus->priv;
 133
 134         if (am->pdata->is_ar7240)
 135                 ar7240sw_phy_write(bus, addr, reg, val);
 136         else
 137                 ag71xx_mdio_mii_write(am, addr, reg, val);
 138         return 0;
 139 }
 140
 141 static int __devinit ag71xx_mdio_probe(struct platform_device *pdev)
 142 {
 143         struct ag71xx_mdio_platform_data *pdata;
 144         struct ag71xx_mdio *am;
 145         struct resource *res;
 146         int i;
 147         int err;
 148
 149         pdata = pdev->dev.platform_data;
 150         if (!pdata) {
 151                 dev_err(&pdev->dev, "no platform data specified\n");
 152                 return -EINVAL;
 153         }
 154
 155         am = kzalloc(sizeof(*am), GFP_KERNEL);
 156         if (!am) {
 157                 err = -ENOMEM;
 158                 goto err_out;
 159         }
 160
 161         am->pdata = pdata;
 162
 163         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 164         if (!res) {
 165                 dev_err(&pdev->dev, "no iomem resource found\n");
 166                 err = -ENXIO;
 167                 goto err_out;
 168         }
 169
 170         am->mdio_base = ioremap_nocache(res->start, res->end - res->start + 1);
 171         if (!am->mdio_base) {
 172                 dev_err(&pdev->dev, "unable to ioremap registers\n");
 173                 err = -ENOMEM;
 174                 goto err_free_mdio;
 175         }
 176
 177         am->mii_bus = mdiobus_alloc();
 178         if (am->mii_bus == NULL) {
 179                 err = -ENOMEM;
 180                 goto err_iounmap;
 181         }
 182
 183         am->mii_bus->name = "ag71xx_mdio";
 184         am->mii_bus->read = ag71xx_mdio_read;
 185         am->mii_bus->write = ag71xx_mdio_write;
 186         am->mii_bus->reset = ag71xx_mdio_reset;
 187         am->mii_bus->irq = am->mii_irq;
 188         am->mii_bus->priv = am;
 189         am->mii_bus->parent = &pdev->dev;
 190         snprintf(am->mii_bus->id, MII_BUS_ID_SIZE, "%s", dev_name(&pdev->dev));
 191         am->mii_bus->phy_mask = pdata->phy_mask;
 192
 193         for (i = 0; i < PHY_MAX_ADDR; i++)
 194                 am->mii_irq[i] = PHY_POLL;
 195
 196         ag71xx_mdio_wr(am, AG71XX_REG_MAC_CFG1, 0);
 197
 198         err = mdiobus_register(am->mii_bus);
 199         if (err)
 200                 goto err_free_bus;
 201
 202         ag71xx_mdio_dump_regs(am);
 203
 204         platform_set_drvdata(pdev, am);
 205         return 0;
 206
 207 err_free_bus:
 208         mdiobus_free(am->mii_bus);
 209 err_iounmap:
 210         iounmap(am->mdio_base);
 211 err_free_mdio:
 212         kfree(am);
 213 err_out:
 214         return err;
 215 }
 216
 217 static int __devexit ag71xx_mdio_remove(struct platform_device *pdev)
 218 {
 219         struct ag71xx_mdio *am = platform_get_drvdata(pdev);
 220
 221         if (am) {
 222                 mdiobus_unregister(am->mii_bus);
 223                 mdiobus_free(am->mii_bus);
 224                 iounmap(am->mdio_base);
 225                 kfree(am);
 226                 platform_set_drvdata(pdev, NULL);
 227         }
 228
 229         return 0;
 230 }
 231
 232 static struct platform_driver ag71xx_mdio_driver = {
 233         .probe          = ag71xx_mdio_probe,
 234         .remove         = __exit_p(ag71xx_mdio_remove),
 235         .driver = {
 236                 .name   = "ag71xx-mdio",
 237         }
 238 };
 239
 240 int __init ag71xx_mdio_driver_init(void)
 241 {
 242         return platform_driver_register(&ag71xx_mdio_driver);
 243 }
 244
 245 void ag71xx_mdio_driver_exit(void)
 246 {
 247         platform_driver_unregister(&ag71xx_mdio_driver);
 248 }